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I have an ODE that has to be solved over a range of x .....but i have difficulties in formulating the boundary conditions since i have certain constraints on them.

My B.C 1 is t(x) = c + (c-1)*erf(x)

B.C 2 is t ' (x) = (c-1)*(2/sqrt(pi))*e^-x2

Hi

I want to tell to Maple how much centimers should be the windows of the plot output (or, even better,  of the grid, without considering the labels and title)

So that if I write for ex

I solved IVP of ODE with solutions x(t),y(t),z(t) numerically.x(0)=y(0)=0,z(0)=0.25

How can I get the coefficients of the initial values in x(t)

i.e  assume the solution

x(t)=e1(t)x(0)+e2(t)y(0)+e3(t)z(0)+e4(t)

how can we get :

e1(t),e2(t),e3(t) and e4(t)

I want to print A with 2 seconds interval from the moment I call x:=true until the moment I call x:=false.

How can this be done in Maple ?

Hi all.

Ok, I'm trying to save to a file a set of a complex number, a float number and an integer. According to Maple Help this can be done with:

writedata[append]('terminal',[-0.123456-0.123456*I, 0.1334423423*10^(-15),3], float, proc(f,x) fprintf(f,`%a`,x) end proc);

And it works (the numbers are just an example of what I'm trying to do).

The problem is that I want to change the precision of the second number (or to all of them) to say 5 digits. But when I try as the help suggests:

I recieved this comment on an older post of mine, and I was going to post a reply, but I noticed my reply was pretty long, and I was also missing a post for last friday, so I figured I'd cheat and make the reply a blog post of its own.

Hi,

How can I plot two boxes with gnuplot in 3 Dimensions, one small box inside one big box? 
I know that it is possible with 
plot3d(Polygon([[x11, y11], ...[xln, yln]], [[x21, y21], ...[x2n, y2n]], ...[[xm1, ym1], ...[xmn, ymn]])

but how can I do with mathematical equations?
 

How do I use print command to display command such as simplify(..,symbolic)?

I have tried

interface(verboseproc=2):
print(simplify);

but this only display simplify command, not  simplify(..,symbolic).

Thanks in advance.

I have a set of simultaneous equations that can be solved using odeplots in Maple.

The problem I have is that i need to understand the chaotic dynamics of this system and to do this i must increase an angle by a tiny amount which boils down to subtracting 1 odeplot from another, how do i do it?

many thanks

f(z):=x^(n)+I y^(n);

diff(f(z), x)=

x^n*n/x

simplify(x^n*n/x)=x^(n-1)*n

plot(e^x*tan(x), x = 0 .. 1)

plot(evalf(e^x*tan(x)), x = 0 .. 1)

question2:

sin(0)=0, why this is not sin(0)?

sin(1)=sin(1)?

Hi all,

I need to use the D Operator for the following:

I need to formally partial-differentiate a given arbitrary function G(z,w) with respect to two other variables z=z(s,t) w=w(s,t) and then to express the p-th-total-order partial derivatives of z with respect to s and t as a polynomial in the partial derivatives of G with respect to z and w and the partial derivatives of w with respect to s and t, divided by the partial derivative of G with respect to z raised to the power 2p+1.   The eliminate function allows me to eliminate all partial derivatives of z w.r.t. s and t of total order lower than p.

I have a 3-dimensional dynamic system of ODEs characterized by zero eigenvalues at the origin. I would like to know if it's possible to find one trajectory converging towards the origin.

My system is derived from a control problem and has consequently control-like and state-like variables -- while the neighborhood is typically unstable I need to know if an appropriate choice of initial values can steer the system towards the origin;  I expect at most one such trajectory.